Biofilms Positively Contribute to Bacillus amyloliquefaciens 54-induced Drought Tolerance in Tomato Plants

Wang, Dacheng; Jiang, Chunhao; Zhang, Lina; Chen, Lin; Zhang, Xiaoyun; Guo, Jianhua

doi:10.3390/ijms20246271

Cited by 59 publications

(20 citation statements)

References 77 publications

(46 reference statements)

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“…Plants that were inoculated with mutants capable of hyper-robust biofilm formation (ΔabrB and ΔywcC) were found to demonstrate drought resistance as compared to plants that were inoculated with mutants having biofilm formation defects (ΔepsA-O and ΔtasA) which could not grow in water deficit conditions. Therefore, these studies confirm that the ability to form biofilms helped the B. amyloliquefaciens 54 strain enhance drought tolerance of tomato plant [67].…”

Section: Fig 2 Roles Of Eps Microbial Exopolysaccharides In Mitigation Of Abiotic Stress and Plant Growth Promotionsupporting

confidence: 64%

Bacterial Exopolysaccharides: Insight into Their Role in Plant Abiotic Stress Tolerance

Bhagat

Raghav

Dubey

et al. 2021

J. Microbiol. Biotechnol.

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Abiotic stresses like drought, salinity, heavy metals, and high or low temperature are major constraints to crop production by being detrimental to the physical, metabolic, and growth development of plants [1]. Plants are often subjected to multiple stresses which are aggravated by climatic changes, use of chemical fertilizers, pesticides and environmental pollution. This situation is more alarming with the increase in world population which is expected to reach around 10 billion by 2050 [2]. There is an urgent need to increase food production by 70% to meet the demand [2]. It is also imperative to find ways to implement new agricultural strategies to protect crops from these multiple abiotic stressors [3].Currently, there are several approaches that enhance plant tolerance to abiotic stress. These include waterconserving irrigation strategies, traditional methods of breeding, and genetic engineering of transgenic plants with abiotic stress tolerance [4]. Plant growth-promoting rhizosphere microorganisms are also now being widely used for restoring soil fertility, remediation of chemical pollutants and to sustain plant growth [5]. They are a proven, effective alternative to conventional methods and a promising strategy for mitigating abiotic stresses. The use of plant growth-promoting microorganisms is a simple alternative approach to genetic engineering and breeding methods for crop improvement since these procedures are time-consuming, expensive, and laborious [6]. These microorganisms improve the root and shoot growth, thus enhancing the water and nutrient absorption from soil [7]. Different types of plant metabolites, such as HCN, 2,4-diacetylphloroglucinol (DAPG) [8], antibiotics, e.g., phenazine [9], and volatile compounds [10] help to enhance plant growth [11][12][13]. Exopolysaccharides, are produced by an array of microorganisms like bacteria, cyanobacteria, microalgae, yeasts, and fungi [14]. These exopolysaccharides impart defense against a wide range of environmental stresses like drought [15], metals [16], salt [17], and temperature [18]. Additionally, EPS facilitate microbe-microbe and microbe-plant interaction, provide antioxidants, store carbon, and supply nutrients to support plant growth [6,19]. Diverse bacterial species like Pseudomonas aeruginosa, Azotobacter vinelandii, Sphingomonas paucimobilis, Azotobacter, Paenibacillus, Klebsiella, Bacillus, and Pseudomonas spp. produce EPS and play an important role in sustaining plant growth in abiotic stress environments [20]. The root microbiome, specifically rhizospheric microbes produce phytohormones, 1-aminociclopropane-1-carboxylase (ACC) deaminase, and EPS to sustain Various abiotic stressors like drought, salinity, temperature, and heavy metals are major environmental stresses that affect agricultural productivity and crop yields all over the world. Continuous changes in climatic conditions put selective pressure on the microbial ecosystem to produce exopolysaccharides. Apart from soil aggregation, exopolysaccharide (EPS) production also helps i...

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Section: Fig 2 Roles Of Eps Microbial Exopolysaccharides In Mitigation Of Abiotic Stress and Plant Growth Promotionsupporting

confidence: 64%

Bacterial Exopolysaccharides: Insight into Their Role in Plant Abiotic Stress Tolerance

Bhagat

Raghav

Dubey

et al. 2021

J. Microbiol. Biotechnol.

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“…Furthermore, adhesion of particles to each other or to a target site is a central aim in different applications. ii. Protection from environment: Biofilms help microorganisms to protect themselves in extreme environments (Yin et al ., 2019), against ultraviolet radiation (UV) (de Carvalho, 2017), extreme temperatures (Smith et al ., 2016; Kent et al ., 2018), pH variations (Narayanan et al ., 2016), salinity or drought stress (Alaa, 2018; Wang et al ., 2019) and limitation of nutrients (Gingichashvili et al ., 2020). In general, a biofilm can be described as a protective matrix in which both the polysaccharide‐producing microorganisms and co‐living cells are encapsulated.…”

Section: Microbial Polysaccharides: Functionalities and Their Applicability In Industrymentioning

confidence: 99%

Water‐soluble polymers in agriculture: xanthan gum as eco‐friendly alternative to synthetics

Berninger¹,

Dietz²,

López

2021

Microbial Biotechnology

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Water-soluble polymers (WSPs) are a versatile group of chemicals used across industries for different purposes such as thickening, stabilizing, adhesion and gelation. Synthetic polymers have tailored characteristics and are chemically homogeneous, whereas plant-derived biopolymers vary more widely in their specifications and are chemically heterogeneous. Between both sources, microbial polysaccharides are an advantageous compromise. They combine naturalness with defined material properties, precisely controlled by optimizing strain selection, fermentation operational parameters and downstream processes. The relevance of such bio-based and biodegradable materials is rising due to increasing environmental awareness of consumers and a tightening regulatory framework, causing both solid and water-soluble synthetic polymers, also termed 'microplastics', to have come under scrutiny. Xanthan gum is the most important microbial polysaccharide in terms of production volume and diversity of applications, and available as different grades with specific properties. In this review, we will focus on the applicability of xanthan gum in agriculture (drift control, encapsulation and soil improvement), considering its potential to replace traditionally used synthetic WSPs. As a spray adjuvant, xanthan gum prevents the formation of driftable fine droplets and shows particular resistance to mechanical shear.Xanthan gum as a component in encapsulated formulations modifies release properties or provides additional protection to encapsulated agents. In geotechnical engineering, soil amended with xanthan gum has proven to increase water retention, reduce water evaporation, percolation and soil erosiontopics of high relevance in the agriculture of the 21st century. Finally, hands-on formulation tips are provided to facilitate exploiting the full potential of xanthan gum in diverse agricultural applications and thus providing sustainable solutions.

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“…is the ability of biofilm formation on plants' surfaces. In a recent report, Wang et al (220) demonstrated that B. amyloliquefaciens 54 inoculation in tomato exerts drought tolerance in plants through enhanced expression levels of stressresponsive genes, such as lea, tdi65, and ltpg2 in the treated plants. Enhancement of drought tolerance was also linked to the enhancement of survival rate, relative water content and root vigor in tomato.…”

Section: Drought Tolerancementioning

confidence: 99%

“…Biofilm forming ability of Bacillus bacteria was positively correlated with plant root colonization. Interestingly, plants inoculated with hyper-robust biofilm-forming (ΔabrB and ΔywcC) mutants were better able to resist drought stress compared to defective biofilm mutants (220). Although a large body of literature is available on the enhancement of drought tolerance in plants by plantassociated bacilli, precise mechanisms of their beneficial actions in plants are still poorly understood.…”

Section: Drought Tolerancementioning

confidence: 99%

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Bacilli as sources of agrobiotechnology: recent advances and future directions

Dame

Rahman

Islam

2021

Green Chemistry Letters and Reviews

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The group bacilli represent the Gram-positive ubiquitous spore-forming bacteria. Their diversity, versatility and the ability of producing diverse secondary metabolites including enzymes created enormous potential for applications in agriculture, biotechnology, environment and medicine. The bacilli are considered as one of the most studied groups of bacteria providing plant growth-promotion and biocontrol of multiple diseases reflecting their vital role in enhancing plants' tolerance to biotic and abiotic stresses. Some of the Bacillus species are available commercially as phytostimulants, biopesticides, and biofertilizers. Genetically engineered plants such as maize, cotton, brinjal with endotoxins producing genes from Bacillus thuringiensis (Bt) has revolutionized agriculture. Many of these applications have been widely adopted in various fields as viable and environmentally friendly alternatives of synthetic chemical fertilizers and pesticides. A better understanding of the biology, ecology, and mechanisms of action of the beneficial strains of bacilli are needed for the development of products to support green biotechnology in agriculture and industries. This report comprehensively reviewed the applications of bacilli in agriculture and industry and discussed their potentials for the development of new products of biotechnological implications.

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Biofilms Positively Contribute to Bacillus amyloliquefaciens 54-induced Drought Tolerance in Tomato Plants

Cited by 59 publications

References 77 publications

Bacterial Exopolysaccharides: Insight into Their Role in Plant Abiotic Stress Tolerance

Bacterial Exopolysaccharides: Insight into Their Role in Plant Abiotic Stress Tolerance

Water‐soluble polymers in agriculture: xanthan gum as eco‐friendly alternative to synthetics

Bacilli as sources of agrobiotechnology: recent advances and future directions

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